Oscillating mass for a watch



FIG. 1 is a front perspective view of my new, original and ornamental design for an oscillating mass for a watch;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a top view thereof. 

The ornamental design for a oscillating mass for a watch, as shown and described. 